Favored Freeware: ClamXav

ClamXav is a free virus checker for MacOS X. It uses the tried, tested, and very popular ClamAV open source antivirus engine as a back end.

Pros: “Back in the days before OS X, the number of viruses which attacked Macintosh users totaled somewhere between about 60 and 80. Today, the number of viruses actively attacking MacOS X users is … none!” So, unless you’d like to be prepared for any future Mac virus outbreaks, ClamXav is technically pointless in a Mac-only environment. But, if you’re in a combined Mac and PC environment, ClamXav is an essential security tool. While Macs cannot be affected by the thousands of available Windows viruses, Macs can still be called “home” by a good number of them. And you, the unsuspecting user, could easily send an infected file to one of your local PCs.

Cons: None significant.

Note: ClamXav is Mac-only, but Linux users should be able to find a GUI and back end complied for their distribution at ClamAV’s site. ClamAV can also be installed and run from the Command Line on any Linux or Unix system. Users of Windows-based PCs should try ClamWin.